Acid trance is a style of
trance music that emerged in the late '80s early '90s focusing on utilising the acid sound. The trademark sound of "acid" is produced with a Roland
TB-303 by playing a sequenced melody while altering the instrument's filter cutoff frequency, resonance, envelope modulation, and accent controls. This real-time tone adjustment was not part of the instrument's original intended operation. Acid trance is the best known form of trance music in
Belgium. The form was first showcased at the popular
Antwerp Rave 24 in Belgium, and has created four national number one singles in the country since.
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